Presentation on theme: "Communities, Biomes, and Ecosystems Chapter 3. Limiting Factors Any abiotic or biotic actor that restricts the numbers, reproduction, or distribution."— Presentation transcript:
Communities, Biomes, and Ecosystems Chapter 3
Limiting Factors Any abiotic or biotic actor that restricts the numbers, reproduction, or distribution of organisms
Examples of Limiting Factors Sunlight Food Water
Range of Tolerance The range of environmental conditions in which an organism can live and reproduce.
Where will you find the greatest diversity? Least # of organisms?
Comparison Limiting Factors Are biotic or abiotic factors that LIMIT the growth of a species. Range of Tolerance Determined by the limiting factors that affect a species.
Ecological Succession The process by which an existing ecosystem is gradually and progressively replaced by another ecosystem
Primary Succession The development of biotic communities in a previously uninhabited and barren habitat with little or no soil. Ex. After lava flow
Pioneer Species First organisms to appear in primary succession Help to create the soil by secreting acid to break down rock Ex. Lichens (fungi/algae combo) & Mosses
Climax Community A relatively stable collection of plants and animals These will change due to environmental factors such as fires, floods, winds, tsunamis, hurricanes, droughts, and other natural disasters.
Secondary Succession The development of biotic communities in an area where the natural vegetation has been removed or destroyed but where soil is present. Ex. After a fire
See figure on Page 64
Comparison Primary Succession The establishment of a community in an area with no soil. Secondary Succession The establishment of a new community in an existing ecosystem that was disturbed.
Where are the most pioneer species? What usually appears last?
Biomes Ecosystems identified by their climax community
Climate The average year-after-year conditions of temperature & precipitation in a particular region The variation of climate primarily depends upon the angle of incoming sunlight